Malaria Quiz: Life Cycle and Causative Agents

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Questions and Answers

What cellular process is associated with the development of merozoites?

  • Meiosis
  • Schizogony (correct)
  • Binary fission
  • Mitosis

Which stage occurs after erythrocystic schizogony?

  • Trophozoite
  • Oocyte
  • Zygote
  • Merozoite (correct)

What is likely the primary habitat for merozoites to develop?

  • Erythrocytes (correct)
  • Tissues
  • Liver cells
  • Plasma

What is the end product of erythrocystic schizogony?

<p>Merozoites (D)</p> Signup and view all the answers

Which term best describes the process of forming multiple daughter cells in one cycle of reproduction?

<p>Schizogony (C)</p> Signup and view all the answers

What type of activity does P. falciparum exhibit?

<p>It acts primarily as a blood schizonticide. (A)</p> Signup and view all the answers

What is a potential adverse drug reaction (ADR) associated with P. falciparum treatment?

<p>Severe hypotension. (B)</p> Signup and view all the answers

Which of the following statements correctly describes a mechanism of action for P. falciparum?

<p>It inhibits the polymerization of heme. (C)</p> Signup and view all the answers

In which patient population should caution be taken when using P. falciparum due to potential adverse effects?

<p>Patients with cardiovascular diseases. (B)</p> Signup and view all the answers

Which of the following is indicated for use in conjunction with P. falciparum to reduce absorption issues?

<p>Calcium supplements. (A)</p> Signup and view all the answers

What is the role of merozoites in the lifecycle described?

<p>They invade red blood cells. (D)</p> Signup and view all the answers

In which organism is gametocyte development primarily noted?

<p>P. falciparum (C)</p> Signup and view all the answers

What is a primary characteristic of the lifecycle of Plasmodium species?

<p>They can remain dormant in the liver. (D)</p> Signup and view all the answers

Which Plasmodium species is known for its rapid invasion of red blood cells?

<p>P. falciparum (D)</p> Signup and view all the answers

How long does the lifecycle stage before symptoms typically last in the liver?

<p>4 weeks (A)</p> Signup and view all the answers

What type of reproduction do gametocytes undergo?

<p>Sexual reproduction (D)</p> Signup and view all the answers

What happens to the gametocytes during the lifecycle?

<p>They are produced in the human host. (D)</p> Signup and view all the answers

What distinguishes P. vivax from other Plasmodium species?

<p>It has a longer liver stage. (B)</p> Signup and view all the answers

What happens to red blood cells (RBC) upon entry of the merozoite?

<p>They experience extensive hemolysis. (C)</p> Signup and view all the answers

Which of the following is a common effect of extensive hemolysis in the blood?

<p>Anemia (C)</p> Signup and view all the answers

What is the role of schizonticides in relation to RBCs?

<p>Target and destroy the parasite within the RBCs. (A)</p> Signup and view all the answers

How does Plasmodium falciparum primarily affect the body?

<p>By causing extensive hemolysis of RBCs. (B)</p> Signup and view all the answers

In which age group is the risk of severe outcomes from this condition particularly high?

<p>Under 5 years old (B)</p> Signup and view all the answers

What is the consequence of tissue hypoxia resulting from RBC destruction?

<p>Reduced tissue function (B)</p> Signup and view all the answers

What likely triggers the onset of anemia in this context?

<p>Extensive hemolysis of RBCs (A)</p> Signup and view all the answers

What is the effect of repeated merozoite invasion on the RBC population?

<p>Higher susceptibility to malaria. (C)</p> Signup and view all the answers

What is the primary use of Coartem?

<p>To combat chloroquine-resistant falciparum malaria (A)</p> Signup and view all the answers

What is the mechanism of action of Artemisinin?

<p>It disrupts protein and nucleic acid synthesis (A)</p> Signup and view all the answers

Which side effect is commonly associated with the use of Artemisinin derivatives?

<p>Drowsiness and delayed hemolysis (C)</p> Signup and view all the answers

What type of solubility do Artesunate and Artemether have respectively?

<p>Artesunate is water soluble; Artemether is lipid soluble (B)</p> Signup and view all the answers

What alternative drug is mentioned for treating malaria?

<p>Mefloquine (A)</p> Signup and view all the answers

Which condition is commonly monitored when using Quinine?

<p>Warfarin and digoxin levels (B)</p> Signup and view all the answers

Which of the following is NOT a common side effect of Mefloquine?

<p>Weight gain (C)</p> Signup and view all the answers

How does Quinine affect blood glucose levels?

<p>It decreases blood glucose levels, causing hypoglycemia (C)</p> Signup and view all the answers

What is the primary purpose of combination therapy in malaria treatment?

<p>To minimize the risk of drug resistance (B)</p> Signup and view all the answers

Which of the following is a property of Coartem?

<p>It combines Artemeter with lumefantrine (A)</p> Signup and view all the answers

What is a clinical manifestation during the cold phase of malaria?

<p>Chills (C)</p> Signup and view all the answers

Which symptom is associated with the hot phase of malaria?

<p>High fever (40.5-41°C) (A)</p> Signup and view all the answers

What complication can occur in severe malaria cases?

<p>Hypoglycemia (B)</p> Signup and view all the answers

What does erythrocytic phase fatigue in malaria indicate?

<p>Tissue hypoxia (D)</p> Signup and view all the answers

Which treatment is commonly used against malaria?

<p>Chloroquine (D)</p> Signup and view all the answers

What can result from anemia caused by malaria?

<p>Fatigue and weakness (B)</p> Signup and view all the answers

What type of malaria is primarily caused by Plasmodium falciparum?

<p>Severe malaria (D)</p> Signup and view all the answers

What characterizes the sweating phase in malaria?

<p>Profuse sweating and temperature drop (B)</p> Signup and view all the answers

In what way does hypoglycemia relate to malaria?

<p>Depletion of glucose levels (C)</p> Signup and view all the answers

What phase of malaria is characterized by initial chills followed by a high fever?

<p>Hot phase (D)</p> Signup and view all the answers

What is a common gastrointestinal symptom in malaria?

<p>Nausea (D)</p> Signup and view all the answers

Which phase includes symptoms such as anorexia and fatigue?

<p>Erythrocytic phase (B)</p> Signup and view all the answers

What condition does malaria NOT typically cause?

<p>Hypertension (A)</p> Signup and view all the answers

Primary and hypnozoites are types of what in the context of malaria?

<p>Parasite stages (A)</p> Signup and view all the answers

Flashcards

Erythrocytic schizogony

A form of asexual reproduction in malarial parasites where the parasite multiplies within red blood cells.

Exoerythrocytic schizogony

A type of asexual reproduction occurring in mosquitos, where the parasite multiplies outside of red blood cells.

Merozoite

A stage in the life cycle of a malarial parasite that invades red blood cells.

Erythrocytic schizogony

A parasite invades a host's red blood cells.

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Exoerythrocytic schizogony

A parasite multiplies outside of a host's red blood cells.

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Piperaquine

A type of antimalarial medication specifically targeting the asexual and gametocyte stages of Plasmodium falciparum.

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Mechanism of action of Piperaquine

Piperaquine works by disrupting the polymerization of heme, a molecule crucial for malaria parasite survival.

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Adverse effects of Piperaquine

Potential adverse effects of Piperaquine include gastrointestinal issues, anorexia, and possible retinal toxicity.

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Severe side effects of Piperaquine

Intramuscular or intravenous administration of Piperaquine can lead to severe hypotension and cardiac arrest.

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Important considerations when using Piperaquine

Piperaquine should be used cautiously in individuals with porphyria and should be administered with calcium supplements.

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Gametocyte

A stage in the life cycle of a malaria parasite where the parasite undergoes sexual reproduction in the mosquito.

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Schizogony

The process of asexual reproduction in the malaria parasite, where a single parasite divides multiple times, producing a large number of offspring.

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Trophozoite

The stage of the malaria parasite's life cycle where the parasite multiplies asexually in the liver cells of a human host.

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Vivax Malaria

A form of malaria caused by Plasmodium vivax parasites, characterized by a recurring pattern of fevers and chills. It can have a dormant stage in the liver and cause relapses.

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Falciparum Malaria

A form of malaria caused by Plasmodium falciparum parasites, considered the most dangerous form, and can cause severe complications like cerebral malaria.

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Transmission of Malaria

The process where the malaria parasite travels from the mosquito to a human through a bite, infecting the human.

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Plasmodium falciparum

A type of malaria parasite that infects red blood cells (RBCs) and can cause severe illness. It's known for its ability to multiply rapidly within the RBCs, leading to a high parasite load.

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Schizonticide

A drug specifically designed to kill the schizont stage of the malaria parasite.

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Hemolysis

The process of red blood cells bursting open, releasing more parasites into the bloodstream.

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Anemia

A condition characterized by a deficiency in red blood cells, often caused by hemolysis.

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Hypnozoite

The phase of the malaria parasite's life cycle where it's dormant and hidden in the liver.

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Tissue schizonticide

A drug that can cure the dormant liver stage of malaria (hypnozoite) caused by P. vivax and P. ovale.

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Initial Malaria Symptoms

The initial symptoms of malaria, often appearing within 10-15 days after infection.

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Erythrocytic Stage

The stage of malaria that occurs when the parasite invades red blood cells.

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Fatigue

A symptom of malaria that causes tiredness and weakness.

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Muscle Pain

A symptom of malaria that causes pain in the muscles and bones.

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Cold Phase

The first phase of the erythrocytic stage of malaria, characterized by chills, shivering, and a drop in body temperature.

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Hot Phase

The second phase of the erythrocytic stage of malaria, where a high fever develops, often reaching 40.5-41°C (104.9-105.8°F).

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Sweating Phase

The third and final phase of the erythrocytic stage of malaria, characterized by profuse sweating, a decline in fever, and relief of symptoms.

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Metabolic Acidosis

A common complication of malaria that causes a buildup of lactic acid in the blood.

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Hypoglycemia

A common complication of malaria that causes low blood sugar.

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Antimalarial Drugs

Anti-malarial drugs used to treat malaria.

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Chloroquine

A common antimalarial drug used to treat malaria.

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Chloroquine Effectiveness

The drug chloroquine is effective against malaria caused by the parasitic species Plasmodium vivax, but it is not effective against the parasitic species Plasmodium falciparum.

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Coartem

A type of antimalarial drug that targets chloroquine-resistant falciparum malaria. It's a combination therapy of artemisinin derivatives and lumefantrine.

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Artemisinin

A class of antimalarial drugs that are highly effective against severe malaria. They work by interfering with parasite growth and development.

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Blood schizonticide

A type of antimalarial that targets both asexual and sexual stages of the parasite in the blood.

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Mechanism of action of Artemisinin

One of the main mechanisms of action for artemisinin is inhibiting the parasite's ability to create proteins and nucleic acids, leading to its death.

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Mefloquine

A type of antimalarial drug that's used as an alternative to chloroquine in cases of malaria. It's effective against both P. falciparum and P. vivax.

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Quinine

A type of antimalarial drug that's commonly used for severe malaria. It's a blood schizonticide that targets both asexual and sexual stages of the parasite.

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Quinine Interaction

An important consideration when administering quinine is to avoid taking it with antacids. Antacids may reduce quinine's effectiveness. Also, quinine may interact with anticoagulants like warfarin and digoxin, so close monitoring is important.

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Artesunate vs. Artemether

Artesunate is a water-soluble form of artemisinin, while artemether is a lipid-soluble form. This allows for different routes of administration and specific targeting.

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Combination therapy in Malaria

Combination therapies, like Coartem, combine multiple antimalarial drugs to increase efficacy and reduce the chances of drug resistance.

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Short half-life of Artemisinin

Apart from its effectiveness, artemisinin is known for its relatively short half-life, meaning it breaks down quickly in the body. This is an important factor to consider when determining dosing regimens and treatment duration.

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Study Notes

Malaria

  • Causative Agents: Plasmodium vivax, P. falciparum

  • Life Cycle: A complex life cycle involving both asexual and sexual stages. There are stages in the liver and stages in red blood cells (RBCs).

  • Asexual Multiplication (in Liver): Sporozoites enter the liver, multiply asexually, resulting in exoerythrocytic schizogony (production of merozoites).

  • Asexual Multiplication (in RBCs): Merozoites invade RBCs, multiply asexually, resulting in erythrocytic schizogony (production of merozoites). This causes hemolysis, leading to anemia.

  • Sexual Multiplication (in RBCs): Some merozoites develop into gametocytes (sexual forms), which are crucial for transmission to mosquitoes. Gametocytes circulate in the blood.

  • P. falciparum: More severe and quick, causing extensive hemolysis and potential tissue hypoxemia. High risk in children under 5.

  • P. malariae: Associated with kidney impairment.

  • Clinical Presentation:

    • Initial: Chills, sweating
    • Erythrocytic: Anorexia, fatigue, abdominal pain, chest pain, diarrhea
    • Specific phases: cold phase (shivering), hot phase (fever), sweating phase.
  • Symptoms can include anemia, enlarged spleen. Severe cases can result in acidosis and hypoglycemia, particularly with P. falciparum.

Antimalarial Drugs

  • Group 1 Drugs: Artemisinins, Chloroquine, Quinine/Quinidine, Tetracycline/Doxycycline. Impact blood stage (both asexual and gametocytes except tetracycline).
  • Group 2 Drugs: Atovaquone. Impacts liver and blood stages (asexual and gametocytes).
  • Group 3 Drugs: Primaquine. Impacts nearly all stages except asexual blood stage.
  • Alternative Drugs: Various drugs are available for different Plasmodium species and situations, including chloroquine and primaquine combinations; artemether-lumefantrine (often Coartem); atovaquone-proguanil (Malarone); mefloquine; piperaquine; and artesunate.

Amebiasis

  • Causative Agent: Entamoeba histolytica
  • Transmission: Fecal-oral route
  • Clinical Presentation: Asymptomatic to severe intestinal infection (colitis, dysentery).
  • Treatment: Metronidazole or Tinidazole.
  • Alternative Drugs: Paromomycin; Tetracycline; or Erythromycin

Helminth Infections

  • Various Helminths: Roundworm Ascariasis; Whipworm Trichuriasis; Hookworm Ancylostoma/Necator; Pinworm Enterobiasis; Threadworm Strongyloidiasis; Fecal-oral or direct contact, depending on organism.
  • Symptoms: Can vary widely depending on organism and stage of infection but can include abdominal pain, diarrhea, cough or anemia.
  • Treatment: Mebendazole; Albendazole; Ivermectin; Praziquantel; Niclosamide.
  • Important Considerations: Drug selection depends on the specific helminth, potential drug resistance, and individual patient factors.

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